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JP2004009402A - Screw for extruder, and its manufacturing process - Google Patents

Screw for extruder, and its manufacturing process Download PDF

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Publication number
JP2004009402A
JP2004009402A JP2002164095A JP2002164095A JP2004009402A JP 2004009402 A JP2004009402 A JP 2004009402A JP 2002164095 A JP2002164095 A JP 2002164095A JP 2002164095 A JP2002164095 A JP 2002164095A JP 2004009402 A JP2004009402 A JP 2004009402A
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JP
Japan
Prior art keywords
screw
extruder
cylinder
hopper
rubber material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002164095A
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Japanese (ja)
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JP4034124B2 (en
Inventor
Takeshi Shimada
島田　剛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP2002164095A priority Critical patent/JP4034124B2/en
Priority to PCT/JP2003/007112 priority patent/WO2003103927A1/en
Priority to EP03733292A priority patent/EP1512514B1/en
Priority to US10/516,516 priority patent/US7811075B2/en
Priority to ES03733292T priority patent/ES2396332T3/en
Publication of JP2004009402A publication Critical patent/JP2004009402A/en
Application granted granted Critical
Publication of JP4034124B2 publication Critical patent/JP4034124B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/507—Screws characterised by the material or their manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • B29C48/595—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw the thread having non-uniform width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/64—Screws with two or more threads
    • B29C48/65—Screws with two or more threads neighbouring threads or channels having different configurations, e.g. one thread being lower than its neighbouring thread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/002—Treads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw for an extruder which can reduce pulsation of an extrudate while maintaining high discharging output. <P>SOLUTION: In a screw 12 which is rotatably supported in a cylinder 11 of an extruder 10 and conveys a rubber material which was warmed with a roll and supplied from a hopper opening 13s provided at a posterior of the cylinder 11 of the extruder 10, a height of a flight section 12z of a traversing section 12s of the hopper opening 13s of the screw 12 is set lower than that of the flight section 12a of a downstream side. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、押出機に用いられるスクリューに関するもので、特に、押出物の脈動を低減するためのスクリューの構造に関する。
【０００２】
【従来の技術】
従来、タイヤトレッド、サイドウォールなどの、ある決められた断面形状が要求されるゴム部材を作製する場合には、通常、スクリューを用いた押出機が使用さている。例えば、タイヤトレッドの押出工程においては、練り上げられたトレッド用配合ゴム材を熱入れロールで加熱して軟らかくし、これを、図３に示すような、押出機５０のホッパー５１に供給し、スクリュー５２により上記ゴム材をシリンダ５３の先端側に搬送し、シリンダ５３の先端側に取付けられたヘッド５４の口金５５から押出すことにより、上記ゴム材を予め設定された断面形状に成形して押出し、その後冷却して必要長さに切断するようにしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記押出機５０は一般に押出機長さ（Ｌ／Ｄ）が短いことから、成形されるゴム材の形状がスクリュー５２の回転の影響を受け易い。そのため、スクリューの構造を変更するなどして押出量（吐出量）を増加させた場合には、吐出の脈動が大きくなってしまうといった問題点があった。
例えば、図４に示すように、全体が２条ネジ構造で、ホッパー口５１ｓ側のみを１条ネジ構造とした高吐出タイプのスクリュー６２を用いた場合には、吐出量は従来に比べて増加するが、上記１条ネジ構造部で供給されたゴム材全てをシリンダ５３内に押し込めようとするため、ホッパー口５１ｓ近傍ではスクリュー６２のフライト部６２Ｆに作用するゴム材からの圧力変動が大きくなる。したがって、図５に示すように、吐出される押出物Ａの脈動も大きくなり、ゲージ変動が増加してしまうといった問題点があった。
特に、押出物がトレッドなどの場合には、上記ゲージ変動がタイヤのユニフォミティやバランスに悪影響を及ぼすので、押出量を増加させた場合でも脈動を低減することのできるスクリューの開発が望まれている。
【０００４】
本発明は、従来の問題点に鑑みてなされたもので、高い吐出量を維持しながら、押出物の脈動を低減することのできる押出機用スクリューを提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明の請求項１に記載の発明は、押出機のシリンダの後部に設けられたホッパー口から供給される、ロールで熱入れされたゴム材を、上記シリンダに回転可能に支持されたスクリューで搬送し、このゴム材を、上記シリンダの先端部に取付けられた口金から予め設定された断面形状に成形して押出す押出機に用いられるスクリューであって、上記スクリューのホッパー口を横切る部位のフライト高さを、下流側のフライト高さよりも低くしたことを特徴とするものである。これにより、スクリュー押出圧，吐出圧を均一化することができるので、押出量を増加させた場合でも、押出物のゲージ変動を低減することが可能となる。
請求項２に記載の発明は、請求項１に記載の押出機用スクリューにおいて、上記ホッパー口を横切る部位のフライト高さを、スクリュー直径の２〜６％だけ低くしたもので、これにより、吐出能力の向上と脈動の低減とを確実に実現することが可能となる。
【０００６】
また、請求項３に記載の発明は、押出機用スクリューの製造方法であって、既存の押出機用スクリューのホッパー口を横切る部位のフライト高さを、スクリュー直径の２〜６％だけ低くなるように、上記部位のスクリュー外周部を切削して、上記スクリューを作製するようにしたことを特徴とする。
【０００７】
【発明の実施の形態】
以下、本発明の実施の形態について、図面に基づき説明する。
図１は、本実施の形態に係る押出機用スクリューを備えた押出機１０の概要を示す模式図で、１１は容器であるシリンダ、１２は上記シリンダ１１内に回転可能に装着されたスクリュー、１３は図示しない熱入れロールで加熱されたゴム材をシリンダ１１内に投入するためのホッパー、１４は上記シリンダ１１の先端側に設けられたヘッド、１５はこのヘッド１４の先端側に取付けられた口金で、この口金１５は、必要とされる所定の断面形状に成形するための開口部１５ａを有する部材で、押出物の種類により交換可能なように、上記ヘッド１４に対して着脱可能に取付けられる。
【０００８】
本例では、スクリュー１２として、図２にも示すように、全体が２条ネジ構造で、ホッパー１３の、シリンダ１１の入り口にかかる箇所である、ホッパー口１３ｓ側のみが１条ネジ構造を有するとともに、ホッパー口１３ｓを横切る位置にあるスクリューフライト部１２ｚの高さが、スクリュー１２の直径Ｄよりも所定量ｄだけ低くなるように、上記フライト部１２ｚの外周部を角度θの範囲わたってスムーズに切削したものを用いた。具体的には、上記ｄをスクリュー１２の直径Ｄの４％前後とした。なお、上記θとしては最大で前，後９０度の範囲とした。なお、下流側のフライト部１２ａの高さは、スクリュー１２の直径Ｄと同じである。
これにより、ホッパー口１３ｓ近傍では、材料戻りが発生するので、ホッパー口１３ｓから投入されたゴム部材は全てシリンダ１１内に押し込められることがない。したがって、ホッパー口１３ｓ近傍での上記フライト部１２ｚへの圧力変動が低減され、押出圧が均一化される。したがって、口金１５の開口部１５ａから押出される押出物の吐出量も均一化されるので、押出物のゲージ脈動を軽減することができる。
上記構成のスクリュー１２を搭載した押出機を用いて、実際にトレッドを押出成形したところ、吐出量は、上記図４に示した、高吐出タイプの押出機用スクリュー６２を用いたときの吐出量と同等で、従来に比べて増加（約２０％）しているにもかかわらず、トレッドのゲージ変動は、上記スクリュー６２を用いた場合のゲージ変動（０．３ｍｍ）の半分（０．１５ｍｍ）に低減した。
【０００９】
なお、上記実施の形態では、従来例の高吐出タイプのスクリュー６２を改良し、吐出量を維持しながら押出物のゲージ変動を低減したが、本発明の対象は上記スクリュー６２に限るものではなく、例えば、全体が１条ネジ構造のスクリューなど他の構造のスクリューに対しても適用可能である。
また、上記例では、既存の押出機用スクリュー１２のホッパー口１３ｓを横切る部位のフライト部１２ｚの外周部を切削したが、新たに押出機用スクリューを作製する場合には、予め、スクリューのホッパー口を横切る部位のフライト部の高さがスクリュー１２の直径の４％前後低くなるよう作製すればよい。
また、ホッパー口１３ｓを横切る部位のスクリューフライト部１２ｚの高さとしては、スクリュー直径の２〜６％だけ低くすればよい。上記低くする量ｄが２％に満たないと、材料戻りが少なく、押出物の脈動を十分に低減することができなくなる。また、６％を超えると、ゴム部材をスムーズにシリンダ１１内に押し込めないので、吐出量の均一化が損なわれる。
【００１０】
【発明の効果】
以上説明したように、本発明によれば、押出機用スクリューのホッパー口を横切る部位のフライト高さを、下流側のフライト高さよりも低くしたので、スクリュー押出圧，吐出圧を均一化することができ、高い吐出量を維持しながら押出物のゲージ変動を低減することができる。
【図面の簡単な説明】
【図１】本実施の形態に係る押出機の構成を示す図である。
【図２】本実施の形態に係る押出機用スクリューの部分拡大図である。
【図３】従来の押出機の構成を示す図である。
【図４】高吐出タイプの押出機用スクリューの構成を示す図である。
【図５】押出物のゲージ変動を説明するための図である。
【符号の説明】
１０　押出機、１１　シリンダ、１２　スクリュー、
１２ａ，１２ｚ　スクリューフライト部、１３　ホッパー、１３ｓ　ホッパー口、１４　ヘッド、１５　口金、１５ａ　開口部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw used in an extruder, and more particularly to a screw structure for reducing pulsation of an extrudate.
[0002]
[Prior art]
Conventionally, when producing a rubber member that requires a predetermined cross-sectional shape, such as a tire tread and a sidewall, an extruder using a screw is usually used. For example, in the tire tread extrusion process, the kneaded rubber material for tread is softened by heating with a hot roll, and this is supplied to a hopper 51 of an extruder 50 as shown in FIG. The rubber material is conveyed to the front end side of the cylinder 53 by 52 and extruded from a base 55 of a head 54 attached to the front end side of the cylinder 53, thereby forming the rubber material into a preset cross-sectional shape and extruding it. Then, it is cooled and cut to the required length.
[0003]
[Problems to be solved by the invention]
However, since the extruder 50 generally has a short extruder length (L / D), the shape of the rubber material to be molded is easily affected by the rotation of the screw 52. For this reason, when the amount of extrusion (discharge amount) is increased by changing the structure of the screw or the like, there has been a problem that the pulsation of discharge becomes large.
For example, as shown in FIG. 4, when a high discharge type screw 62 having a double thread structure as a whole and a single thread structure only on the hopper port 51s side is used, the discharge amount is increased as compared with the conventional case. However, since all the rubber material supplied by the single thread structure is to be pushed into the cylinder 53, the pressure fluctuation from the rubber material acting on the flight part 62F of the screw 62 increases in the vicinity of the hopper port 51s. . Therefore, as shown in FIG. 5, there is a problem that the pulsation of the extrudate A to be discharged also increases and the gauge fluctuation increases.
In particular, when the extrudate is a tread or the like, the gauge fluctuation adversely affects the tire uniformity and balance. Therefore, it is desired to develop a screw capable of reducing pulsation even when the amount of extrusion is increased. .
[0004]
The present invention has been made in view of conventional problems, and an object of the present invention is to provide a screw for an extruder that can reduce the pulsation of an extrudate while maintaining a high discharge rate.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention is a screw which is supplied from a hopper port provided at the rear part of a cylinder of an extruder and which is heated by a roll and is rotatably supported by the cylinder. A screw used in an extruder for conveying and molding the rubber material into a preset cross-sectional shape from a die attached to the tip of the cylinder, and for crossing the hopper mouth of the screw The flight height is lower than the downstream flight height. Thereby, since screw extrusion pressure and discharge pressure can be made uniform, even when the amount of extrusion is increased, it is possible to reduce gauge fluctuations of the extrudate.
The invention according to claim 2 is the screw for an extruder according to claim 1, in which the flight height of the portion crossing the hopper port is lowered by 2 to 6% of the screw diameter. It is possible to reliably realize improvement of capability and reduction of pulsation.
[0006]
The invention according to claim 3 is a method for manufacturing an extruder screw, wherein the flight height of a portion crossing the hopper port of an existing extruder screw is reduced by 2 to 6% of the screw diameter. As described above, the screw is manufactured by cutting the outer peripheral portion of the screw at the site.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an outline of an extruder 10 equipped with an extruder screw according to the present embodiment, 11 is a cylinder as a container, 12 is a screw rotatably mounted in the cylinder 11, Reference numeral 13 denotes a hopper for introducing a rubber material heated by a heating roll (not shown) into the cylinder 11, 14 is a head provided on the tip side of the cylinder 11, and 15 is attached to the tip side of the head 14. The base 15 is a member having an opening 15a for forming a required predetermined cross-sectional shape, and is detachably attached to the head 14 so as to be exchanged depending on the type of extrudate. It is done.
[0008]
In this example, as shown in FIG. 2, the screw 12 has a two-thread structure as a whole, and only the hopper port 13 s side, which is a portion of the hopper 13 that is applied to the inlet of the cylinder 11, has a one-thread structure. At the same time, the outer periphery of the flight part 12z is smooth over the range of the angle θ so that the height of the screw flight part 12z at the position crossing the hopper port 13s is lower than the diameter D of the screw 12 by a predetermined amount d. What was cut into was used. Specifically, the above d was set to around 4% of the diameter D of the screw 12. Note that the maximum θ is 90 ° before and after. The height of the downstream flight part 12 a is the same as the diameter D of the screw 12.
As a result, material return occurs in the vicinity of the hopper port 13 s, so that all the rubber member introduced from the hopper port 13 s is not pushed into the cylinder 11. Therefore, the pressure fluctuation to the flight part 12z in the vicinity of the hopper port 13s is reduced, and the extrusion pressure is made uniform. Therefore, since the discharge amount of the extrudate extruded from the opening 15a of the base 15 is also made uniform, the gauge pulsation of the extrudate can be reduced.
When the tread was actually extruded using the extruder equipped with the screw 12 having the above-described configuration, the discharge amount was the discharge amount when the high-discharge type extruder screw 62 shown in FIG. 4 was used. The tread gauge fluctuation is half (0.15 mm) of the gauge fluctuation (0.3 mm) when the screw 62 is used, even though it is increased (about 20%) compared to the conventional case. Reduced to
[0009]
In the above embodiment, the high discharge type screw 62 of the conventional example is improved and the gauge fluctuation of the extrudate is reduced while maintaining the discharge amount. However, the object of the present invention is not limited to the screw 62. For example, the present invention can be applied to a screw having another structure such as a screw having a single thread structure as a whole.
Further, in the above example, the outer peripheral portion of the flight portion 12z in a portion crossing the hopper port 13s of the existing extruder screw 12 is cut. However, when a screw for the extruder is newly produced, a screw hopper is previously prepared. What is necessary is just to produce so that the height of the flight part of the site | part which crosses a mouth may become about 4% lower than the diameter of the screw 12. FIG.
Further, the height of the screw flight part 12z at the portion crossing the hopper port 13s may be lowered by 2 to 6% of the screw diameter. If the amount d to be lowered is less than 2%, the material return is small and the pulsation of the extrudate cannot be sufficiently reduced. On the other hand, if it exceeds 6%, the rubber member cannot be pushed into the cylinder 11 smoothly, so that the discharge amount is not uniform.
[0010]
【The invention's effect】
As described above, according to the present invention, since the flight height of the portion crossing the hopper port of the screw for the extruder is made lower than the flight height on the downstream side, the screw extrusion pressure and the discharge pressure are made uniform. The gauge fluctuation of the extrudate can be reduced while maintaining a high discharge amount.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an extruder according to the present embodiment.
FIG. 2 is a partially enlarged view of an extruder screw according to the present embodiment.
FIG. 3 is a diagram showing a configuration of a conventional extruder.
FIG. 4 is a diagram showing a configuration of a screw for a high discharge type extruder.
FIG. 5 is a diagram for explaining gauge fluctuation of an extrudate.
[Explanation of symbols]
10 extruders, 11 cylinders, 12 screws,
12a, 12z Screw flight part, 13 hopper, 13s hopper mouth, 14 heads, 15 mouthpiece, 15a opening.

Claims (3)

押出機のシリンダの後部に設けられたホッパー口から供給される、ロールで熱入れされたゴム材を、上記シリンダに回転可能に支持されたスクリューで搬送し、このゴム材を、上記シリンダの先端部に取付けられた口金から予め設定された断面形状に成形して押出す押出機に用いられるスクリューであって、上記スクリューのホッパー口を横切る部位のフライト高さを、下流側のフライト高さよりも低くしたことを特徴とする押出機用スクリュー。A rubber material heated by a roll, which is supplied from a hopper port provided at the rear part of the cylinder of the extruder, is conveyed by a screw rotatably supported by the cylinder, and the rubber material is conveyed to the tip of the cylinder. A screw used in an extruder that is molded into a preset cross-sectional shape from a base attached to a part and extruded, and the flight height of a portion crossing the hopper mouth of the screw is set to be lower than the flight height on the downstream side. A screw for an extruder characterized by being lowered. 上記ホッパー口を横切る部位のフライト高さを、スクリュー直径の２〜６％だけ低くしたことを特徴とする請求項１に記載の押出機用スクリュー。The screw for an extruder according to claim 1, wherein a flight height at a portion crossing the hopper mouth is lowered by 2 to 6% of a screw diameter. 既存の押出機用スクリューのホッパー口を横切る部位のフライト高さを、スクリュー直径の２〜６％だけ低くなるように、上記部位のスクリュー外周部を切削することを特徴とする押出機用スクリューの製造方法。An extruder screw characterized by cutting the outer periphery of the screw at the above part so that the flight height of the part across the hopper mouth of the existing extruder screw is lowered by 2 to 6% of the screw diameter. Production method.
JP2002164095A 2002-06-05 2002-06-05 Extruder screw and method for producing the same Expired - Fee Related JP4034124B2 (en)

Priority Applications (5)

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JP2002164095A JP4034124B2 (en) 2002-06-05 2002-06-05 Extruder screw and method for producing the same
PCT/JP2003/007112 WO2003103927A1 (en) 2002-06-05 2003-06-05 Screw for extruder and method of manufacturing the extruder, and rubber member for tire and method of manufacturing the rubber member
EP03733292A EP1512514B1 (en) 2002-06-05 2003-06-05 Extruder screw
US10/516,516 US7811075B2 (en) 2002-06-05 2003-06-05 Screw for extruder and method of manufacturing the extruder, and rubber member for tire and method of manufacturing the rubber member
ES03733292T ES2396332T3 (en) 2002-06-05 2003-06-05 Screw auger for extruders and their production process, and rubber element for tires and their production process

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EP1512514A1 (en) 2005-03-09
US20060062076A1 (en) 2006-03-23
EP1512514B1 (en) 2012-10-17
WO2003103927A1 (en) 2003-12-18
ES2396332T3 (en) 2013-02-20
US7811075B2 (en) 2010-10-12
JP4034124B2 (en) 2008-01-16
EP1512514A4 (en) 2010-07-21

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